Langer's Sudoku Assistant

Invalid Sudoku!

Row 5 is invalid. Column 2 is invalid. The middle left 3x3 Box is invalid. Go back and make a different choice.

 

8
4
9
1      
   5  6
       
7
1      
   5  6
       
2
1      
   5  6
       
3
7
1
3
6
2
4
5
9
8
2
6
5
9
8
3
7
4
1
9
5
5
1
5
2
3
8
7
1
8
2
3
4
7
9
6
5
3
7
6
5
9
8
1
2
4
5
3
8
7
9
4
1      
      6
       
2
1      
      6
       
2
7
6
8
3
1
4
5
9
4
1
9
6
5
2
8
3
7

 

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